Paper can body



R. GUYER PAPER CAN BODY Filed July 25. lS

March 8, 1949.I

Patented Mar. 8, 1949 UNITED STATES PATENTV OFFICE PAPER CAN BGDYReynolds Guyer, St. Paul, Minn., asslgnor to Waldori' Paper ProductsCompany, St. Paul, Minn., a corporation of Minnesota Application .my z5,1945, serial Ne. 606,997 claims. (ci. 229-45) 1 My invention relates toan improvement in paper can body. The method of forming this can bodyand the apparatus for performing the method are disclosed in a copendingapplication Serialhave proven satisfactory insofar as4 containingpackaged products is concerned, their manufacture has certaindiiiiculties. In the first place such tubes normally must be formed inlong lengths and then cut into smallerlengths, there' by requiring twoseparate operations. In the second place, it is usually necessary toeither wrap a label on such a can body or else to print the Y body afterformation thereof. Furthermore such can bodies often have spiral groovesextending about the same which detract from their appearance andstrength. t

It is the object of the present invention to produce can bodies out ofnat sheets of paper stock. This at stock may be easily printed beforethe bodies are formed, thereby obviating the requirement for a separatelabel. Furthermore, the can bodies may be stored in flat form until theyare desired, and then quickly formed into tubular formation. As a resultit is not necessary to maintain a large inventory of formed paper canbodies which require costly spaceto store before use.

A feature of the present invention, residesin the formation ofcylindrical can bodies by bending a plurality of at sheets into tubularformation with one sheet overlying the other. As a. result a cylindricalcan body may be formed of a plurality of laminations of paper board orthe like.

A further feature of the present invention lies in the provision of acan body constructed of sheets of paper board bent yinto cylindricalform to provide a laminated body, and in so placing the sheets that thebutt edges of the various laminations are in angular-ly spacedrelationship.

An additional object of the present invention is to produce a can bodystructure of` a series of overlying sheets coated with a. thermoplasticcoating. Thus when the ilat sheets have been bent into cylindrical form'and are .positioned in overlying relationship, these sheets may be ad?hered together by the application of heat and pressure. v

These and other objects andnovel features of my invention will be moreclearly and fully set forth in the following specication and claims.

In the drawings forming a part of my speciiication:

Figure 1 isa perspective view of a can, the body of which has beenformed by my method.

Figure 2 is a sectional view through the can body lshowing theconstruction thereof.-

Figure 3 is a sectional view through a modiiiedform'of can bodyconstruction. @Figure 4 is a perspective view of one of the sheets ofwhich the can body shown in Figure 3 vis formed before the sheet is bentinto cylindribody are exposed on theinner surface of the l having threeplies of material, but using only twov v cal form.

The can A` shown in Figures 1 and 2 of the drawings includes acylindrical side wall- B made of paper orsimilar material bent from atinto cylindrlcalform. The can'A is shown having metal ends Il` and I2which are crimped onto the ends of the side wall B in the usual manner.The closure Il may include a lling aperture normally closed by a plugcap I3 if it is so desired. Can ends of the type illustrated have beencommonly used for considerable period of years.

In order to show the construction of the side Wall body A, I have shownthis lbody in section in Figure 2- of the drawings. Figure 2 illustratesan inner sheet I4 which is provided with butting longitudinal edges I5and i6. This inner sheet I4 isencircled by a second or outer sheet I1having butting longitudinal edges i9 and 20. The sheets I4 and I1 aresecured together byl any suitable means lsuch as the layer o fthermoplastic adhesive 2| between these sheets. Other adhesive couldlikewise be used but the thermoplastic adhesive is to be preferred.v

Figure 3 of the drawings shows a modified form of constructionparticularly suited for containing liquids or thev like. In this form ofconstruction C, no cut edges of any of the .sheets forming the can, thuspreventing any tendency for the body forming'material to absorb moistureby wicka'ge. Furthermore thelcan body C results in a structure iiatsheets of material.

InV the can body construction C, the inner sheet 23 is folded vat 24 and25 along parallel lines so that the longitudinal edges 26 and 21 thereofmay overlie portions of the intermediate section of the sheet. In otherwords, as illustrated in Figure 4 j the sheet'i's'divided into threepanels comprising an intermediate panel and two end panels foldablyconnected thereto along. parallel fold lines. The end panels are each ofabout one-fourth the area of the intermediate panel so that when theinner sheet is curved as illustrated in Figure 3 the outer panels 26 and21 will form a substantially semi-circular double sheet.

The outer sheet 29 of the can wall body is formed similarly to the innersheet and includes a central panel 30 and two end panels 3l and 32connected thereto along parallel lines of fold 33 and 34. These endpanels 3l and 32 comprise approximately one-quarter of the area of thepanel 30 so that when the outer sheet 29 is folded as illustrated inFigure 4 the panels 3| and 32 form a substantially semi-circular doublethickness portion.

When the two sheets 23 and`29 are folded as shown the marginal edges 35and 36 of the panels 26 and 21 respectively, abut the edges 31 and 39 ofthe panels 3| and 32. Accordingly a can body is formed of threethicknesses of material which has no raw edges exposed either to theinside or to the outside ofthe body.

It will be noted that the can body material forming the liner of thewall is provided with two abutting folds 24 and 25, While the outercovering sheet 29 is likewise provided with two abutting folds 33 and34, exposed to the outside of the can. The raw edges 35, 36, 31 and 39are concealed, being locked between midpoints of the covering panels.'As the ends of the tubular body are contained Within the beaded edge ofthe can end, the can wall body is protected from wicking or moistureabsorption.

The can body wall shown in Figure 3 may be provided with ends similar tothat illustrated in Figure 1 of the drawings. When thus equipped a canwall which is liquid tight and wick proof is provided. This isparticularly true if the sheets forming the can body are coated with athermoplastic coating or a waterproof coating' which will prevent theliquid from penetrating into the wall. The thermoplastic coatingprovides a tight joint between the various laminations, thus preventingliquid from escaping between the Various plies.

In accordance with the patent statutes, I have described the principlesof construction and operation of my paper can body, and while I haveendeavored to set forth the best embodiment thereof, I desire to have itunderstood that obvious changes may be made within the scope of thefollowing claims without departing from the spirit of my invention. v

I claim:

1. A can comprising a can wall including an inner sheet comprising acentral panel and end panels foldably secured thereto to overlie endportions of the central panel, the folded edges of said central panelbeing in abutting relation,

and a second sheet having ends in abutting relation secured to encirclesaid first named sheet.

sheets of fibrous material, one of said sheets comprising a centralpanel and end panels foldably connected to opposite edges of saidcentral panel to overlie portions of said central panel, said foldededges of said central panel being arranged in abutting relation, and theother of said sheets having edges in abutting relation, the butt jointof one sheet being angularly spaced from the butt joint of the other.

3. A can comprising a can body wall, said wall including a pair oflaminations, the inner of said laminations including a central panelformed in tubular form with the edges thereof in abutting relation, andend panels foldably connected to said central panel along said abuttingedges, the outer of said laminations encircling the inner lamination andincluding a central panel having ends in abutting relation, and endpanels connected to said central panel along said abutting edges, theextremities of ,said end panels of said inner lamination facing theextremities of the end panels of said outer lamination. y

4. A can comprising a can body wall, said wall including a pair oflaminations, the inner of said laminations including a central panelformed in tubular form with the edges thereof in abutting relation, andend panels foldably connected to said central panel along said abuttingedges, the

louter of said laminations encircling the inner lamination and includinga central' panel having ends in abutting relation, and end panelsconnected to said central panel along said abutting edges, theextremities of said'end panels of said inner lamination facing theextremities of the end panels of said outer lamination, and a coating ofthermoplastic adhesive between said laminations for securing the sametogether. u

5. A can comprising a can body wall, said wall including a pair oflaminations, the inner of said laminationsincluding aV central panelformedfln REFERENCES CITED The following references areV of record inthe iile of this patent:

lUNITED STATES PATENTS Number Name Date 1,463,437 Oliver July 31, 19231,741,809 Benson Dec. 31 1929- 2,149 .030 Moore Feb, 28, 1939 2,155,487Hatch v Apr. 25, 1939

